#[non_exhaustive]pub enum NotificationContentType {
PlainText,
Unknown(UnknownVariantValue),
}
Expand description
When writing a match expression against NotificationContentType
, it is important to ensure
your code is forward-compatible. That is, if a match arm handles a case for a
feature that is supported by the service but has not been represented as an enum
variant in a current version of SDK, your code should continue to work when you
upgrade SDK to a future version in which the enum does include a variant for that
feature.
Here is an example of how you can make a match expression forward-compatible:
# let notificationcontenttype = unimplemented!();
match notificationcontenttype {
NotificationContentType::PlainText => { /* ... */ },
other @ _ if other.as_str() == "NewFeature" => { /* handles a case for `NewFeature` */ },
_ => { /* ... */ },
}
The above code demonstrates that when notificationcontenttype
represents
NewFeature
, the execution path will lead to the second last match arm,
even though the enum does not contain a variant NotificationContentType::NewFeature
in the current version of SDK. The reason is that the variable other
,
created by the @
operator, is bound to
NotificationContentType::Unknown(UnknownVariantValue("NewFeature".to_owned()))
and calling as_str
on it yields "NewFeature"
.
This match expression is forward-compatible when executed with a newer
version of SDK where the variant NotificationContentType::NewFeature
is defined.
Specifically, when notificationcontenttype
represents NewFeature
,
the execution path will hit the second last match arm as before by virtue of
calling as_str
on NotificationContentType::NewFeature
also yielding "NewFeature"
.
Explicitly matching on the Unknown
variant should
be avoided for two reasons:
- The inner data
UnknownVariantValue
is opaque, and no further information can be extracted. - It might inadvertently shadow other intended match arms.
Variants (Non-exhaustive)§
This enum is marked as non-exhaustive
PlainText
Unknown(UnknownVariantValue)
Unknown
. See the docs on this enum for the correct way to handle unknown variants.Unknown
contains new variants that have been added since this code was generated.
Implementations§
source§impl NotificationContentType
impl NotificationContentType
sourcepub fn try_parse(value: &str) -> Result<Self, UnknownVariantError>
pub fn try_parse(value: &str) -> Result<Self, UnknownVariantError>
Parses the enum value while disallowing unknown variants.
Unknown variants will result in an error.
Trait Implementations§
source§impl AsRef<str> for NotificationContentType
impl AsRef<str> for NotificationContentType
source§impl Clone for NotificationContentType
impl Clone for NotificationContentType
source§fn clone(&self) -> NotificationContentType
fn clone(&self) -> NotificationContentType
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
source
. Read moresource§impl Debug for NotificationContentType
impl Debug for NotificationContentType
source§impl From<&str> for NotificationContentType
impl From<&str> for NotificationContentType
source§impl FromStr for NotificationContentType
impl FromStr for NotificationContentType
source§impl Hash for NotificationContentType
impl Hash for NotificationContentType
source§impl Ord for NotificationContentType
impl Ord for NotificationContentType
source§fn cmp(&self, other: &NotificationContentType) -> Ordering
fn cmp(&self, other: &NotificationContentType) -> Ordering
1.21.0 · source§fn max(self, other: Self) -> Selfwhere
Self: Sized,
fn max(self, other: Self) -> Selfwhere
Self: Sized,
source§impl PartialEq for NotificationContentType
impl PartialEq for NotificationContentType
source§fn eq(&self, other: &NotificationContentType) -> bool
fn eq(&self, other: &NotificationContentType) -> bool
self
and other
values to be equal, and is used
by ==
.source§impl PartialOrd for NotificationContentType
impl PartialOrd for NotificationContentType
source§fn partial_cmp(&self, other: &NotificationContentType) -> Option<Ordering>
fn partial_cmp(&self, other: &NotificationContentType) -> Option<Ordering>
1.0.0 · source§fn le(&self, other: &Rhs) -> bool
fn le(&self, other: &Rhs) -> bool
self
and other
) and is used by the <=
operator. Read moreimpl Eq for NotificationContentType
impl StructuralPartialEq for NotificationContentType
Auto Trait Implementations§
impl RefUnwindSafe for NotificationContentType
impl Send for NotificationContentType
impl Sync for NotificationContentType
impl Unpin for NotificationContentType
impl UnwindSafe for NotificationContentType
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
§impl<Q, K> Comparable<K> for Q
impl<Q, K> Comparable<K> for Q
§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
§impl<Q, K> Equivalent<K> for Q
impl<Q, K> Equivalent<K> for Q
§fn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
key
and return true
if they are equal.